Hello sysadmin. Good luck navigating the internet.

What you should know, and what your browser does know and automatically applies cookie policy and colouring your URL bar, is the Public Suffix List: https://en.wikipedia.org/wiki/Public_Suffix_List

It will let you know that, for example, one does not need to own .co.uk to own the subdomain foo.co.uk.

The public suffix list is a half assed bandaid over a fundamentally broken system.

The .name mess is not in the public suffix list.

https://github.com/publicsuffix/list/issues/2306 for more discussion.

I appreciate this, and yeah the government/education ones slipped my mind, but I stand by the fact that the reason a list needs to be kept in the first place is because this is the edge case and not the norm.